Weight has nothing to do with the ability to open a window exit. I'll take an over-weight pax, f/a, pilot, whatever over the sanctimonious views of some of the previous posters any day. That extra weight might just have the strength to get the exit out of the way or cushion the fall of those brain starved anorexics. I know, go back to under 30, not married, no mothers (or God forbid fathers), gays, African Americans, or anyone that doesn't fit the myth of the before women's rights "stewardess". ps I was PanAm, then TWA, so I was the "myth". Having been in the training dept. for several years, you would be very surprised what will fit through a window exit. Add the adrenalin of an evacuation and I don't think you have much to worry about.